PID Controller

I am looking for a C program that works like a PID controller. It is for educational purpose. Thank you.
PID Controller

I am looking for a C program that works like a PID controller. It is for educational purpose. Thank you.
Digital PID routine

I need a digital pid routine for 8051 can anyone help?
USBH_DeviceRequest_GetDescriptor for pid

Hi, I need to get pid and vid of usb connected. i used the USBH_DeviceRequest_GetDescriptor function to get the DEVICE DESCRIPTOR. But how i can extract pid and vid from this function. Regards...
PID control coding

please help me, i am a M.Tech student, code for PIC micro controller based temperature controller with PID control